I then noticed a bright green paper zip-tied to the handlebar and, curious, went in for a closer look.
Please do not park on the 16th Street Mall
There are over 600 designated bicycle parking racks throughout Downtown, including at each intersection of the Mall. Parking your bicycle at locations such as street lights, trees, railings or other furnishings on the 16th Street Mall is prohibited*, can cause property damage and may limit pedestrian access on this pedestrian-transit street.
Please be aware that bicycles parked along the 16th Street Mall that impede pedestrian or shuttle traffic may be impounded by Denver Police.
Please contact the Downtown Denver Partnership with any questions about bicycling in Downtown Denver at 303.534.6161
* Section 54-575 RMC
I continued to see these notices attached to bikes all along the mall. I had neither seen nor heard of such things before, so I promptly asked the Internet what it was all about. I promptly got a few replies.
The referenced section of the Revised Municipal Code says you can park on the sidewalk in a rack "as to not impede the normal and reasonable movement of pedestrian or other traffic." It doesn't seem to say anywhere that you can't park next to signs or posts, but that definitely appears to be how it's being interpreted here.
The 16th Street Mall must be the most bike restrictive place in Denver. You cannot ride there, but you can on Sundays, but you can never park there.